<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebSocket客户端</title>
</head>
<body>
    <script text="text/javascript">
        var socket;

        if (window.WebSocket) {
            socket = new WebSocket("ws://localhost:8899/ws");
            socket.onmessage = function (event) {
                var ta = document.getElementById("responseText");
                ta.value = ta.value + "\n" + event.data;
            };

            socket.onopen = function (event) {
                alert("已连接");
                var ta = document.getElementById("responseText");
                ta.value = "连接开启！";
            };

            socket.onerror = function (event) {
                alert("出错了");
            };

            socket.onclose = function (event) {
                var ta = document.getElementById("responseText");
                ta.value = "连接关闭！"
            };
        } else {
            alert("游览器不支持WebSocket");
        }


        function send(message) {
            if (!window.WebSocket) {
                return;
            }
            console.log(socket.readyState);
            if (socket.readyState === WebSocket.OPEN) {
                socket.send(message);
            } else {
                alert("连接尚未开启! ");
            }
        }
    </script>

    <form onsubmit="return false;">
        <textarea name="message" style="width: 400px;height: 200px"></textarea>
        <input type="button" value="发送数据"  onclick="send(this.form.message.value)">
        <h3>服务端输出：</h3>
        <textarea id="responseText" style="width: 400px;height: 200px"></textarea>
        <input type="button" value="清空内容" onclick="javascript: document.getElementById('responseText').value=''">
    </form>

</body>
</html>